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MC74VHCT245AMELG Scheda tecnica(PDF) 2 Page - ON Semiconductor

Il numero della parte MC74VHCT245AMELG
Spiegazioni elettronici  Octal Bus Transceiver
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Produttore elettronici  ONSEMI [ON Semiconductor]
Homepage  http://www.onsemi.com
Logo ONSEMI - ON Semiconductor

MC74VHCT245AMELG Scheda tecnica(HTML) 2 Page - ON Semiconductor

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MC74VHCT245A
http://onsemi.com
2
Figure 1. Logic Diagram
A
DATA
PORT
A8
A7
A6
A5
A3
A4
A2
A1
9
8
7
6
5
4
3
2
DIR
OE
1
19
18
17
16
15
14
13
12
11
B1
B2
B3
B4
B5
B6
B7
B8
B
DATA
PORT
Figure 2. Pin Assignment
A5
A3
A2
A1
DIR
GND
A8
A7
A6
A4
5
4
3
2
1
10
9
8
7
6
14
15
16
17
18
19
20
11
12
13
B3
B2
B1
OE
VCC
B8
B7
B6
B5
B4
OE
DIR
Operation
L
L
H
L
H
X
Data Tx from Bus B to Bus A
Data Tx from Bus A to Bus B
Buses Isolated (High−Z State)
Control Inputs
FUNCTION TABLE
MAXIMUM RATINGS
Symbol
Parameter
Value
Unit
VCC
DC Supply Voltage
– 0.5 to + 7.0
V
Vin
DC Input Voltage
– 0.5 to + 7.0
V
VI/O
DC Output Voltage
Outputs in 3−State
High or Low State
– 0.5 to + 7.0
– 0.5 to VCC + 0.5
V
IIK
Input Diode Current
− 20
mA
IOK
Output Diode Current (VOUT < GND; VOUT > VCC)
± 20
mA
Iout
DC Output Current, per Pin
± 25
mA
ICC
DC Supply Current, VCC and GND Pins
± 75
mA
PD
Power Dissipation in Still Air,
SOIC Packages†
TSSOP Package†
500
450
mW
Tstg
Storage Temperature
– 65 to + 150
_C
Maximum ratings are those values beyond which device damage can occur. Maximum ratings
applied to the device are individual stress limit values (not normal operating conditions) and are
not valid simultaneously. If these limits are exceeded, device functional operation is not implied,
damage may occur and reliability may be affected.
†Derating − SOIC Packages: – 7 mW/
_C from 65_ to 125_C
TSSOP Package: − 6.1 mW/
_C from 65_ to 125_C
RECOMMENDED OPERATING CONDITIONS
Symbol
Parameter
Min
Max
Unit
VCC
DC Supply Voltage
4.5
5.5
V
Vin
DC Input Voltage
0
5.5
V
VI/O
DC Output Voltage
Outputs in 3−State
High or Low State
0
0
5.5
VCC
V
TA
Operating Temperature
− 40
+ 85
_C
tr, tf
Input Rise and Fall Time
VCC =5.0V ±0.5V
0
20
ns/V
This device contains protection
circuitry to guard against damage
due to high static voltages or electric
fields. However, precautions must
be taken to avoid applications of any
voltage higher than maximum rated
voltages to this high−impedance cir-
cuit. For proper operation, Vin and
Vout should be constrained to the
range GND
v (Vin or Vout) v VCC.
Unused inputs must always be
tied to an appropriate logic voltage
level (e.g., either GND or VCC).
Unused outputs must be left open.


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